Supplemental Disclosure About Natural Gas, Oil and NGL Producing Activities (Summary of Changes in The Standardized Measure of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 30, 2011	Dec. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Disclosures About Natural Gas, Oil and NGL Producing Activities (Summary of Changes in the Standardized Measure of Cash Flows) [Abstract]
Standardized Measure, Beginning of Period				$ 14,666	$ 15,630	$ 13,183	$ 8,203
Sales and Transfers of Oil and Gas Produced, Net of Production Costs	(3,867)	(3,993)	(3,199)
Net Increase (Decrease) in Sales and Transfer Prices and Production Costs	(2,720)	512	3,337
Extensions, Discoveries, Additions and Improved Recovery, Less Related Costs	11,115	9,139	5,580
Changes in Estimated Future Development Costs	3,687	667	173
Development Costs Incurred During the Period That Reduced Future Development Costs	1,046	680	717
Revisions of Previous Quantity Estimates	(8,699)	(708)	199
Purchases of Reserves-in-Place	285	50	255
Decrease Due to Sales of Minerals in Place	(3,246)	(2,083)	(2,235)
Accretion of Discount	1,988	1,515	945
Changes in Future Income Tax Expense Estimates on Future Cash Flows Related to Proved Oil and Gas Reserves	1,142	(2,286)	(716)
Increase (Decrease) In Production Rates And Other	(1,695)	(1,046)	(76)
Standardized Measure, End of Period				$ 14,666	$ 15,630	$ 13,183	$ 8,203